Sometime between World War One and World War Two, the Department of the Army had an organization called The Office of Strategic Security [OSS] was headed by a Lieutenant General (3-star) of the United States Army.
The mission of the OSS was to gather Military Intelligence [MI] and they were active during World War Two in the European and Pacific campaigns. Tow of the most notable OSS members were the Dulles brothers, Allen and John Foster.
President Harry S. Truman reorganized his Administration when he signed the National Security Act of 11947. The Department of the Army was changed to the Department of Defense [DOD] and the Office of Strategic Security was deactivated.
Two new organizations were formed in his administration because of the National Security Act of 1947, the Central Intelligence Agency [CIA] headed by Allen Dulles and the National Security Agency [NSA] headed by a military General of the United States Armed Forces.
The mission of the Central Intelligence Agency was to protect the United States of America fom intelligence gathering by other foreign countries.
The mission of the National Security Agency was assigned to the Department of Defense under the head of a military General to protect the homeland. When the National Security Agency was assigned to the Department of Defense it had the overview of three United States Military Security groups; the Air Force Security Services, the Army Security Agency, and the Naval Security Service. Their missions were to collect military intelligence.
It should be noted that John Foster Dulles served as the Secretary of State under President John F. Kennedy’s State Department in 1960.
